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QCD matrix elements + parton showers : the NLO case.

Höche, S. and Krauss, F. and Schönherr, M. and Siegert, F. (2013) 'QCD matrix elements + parton showers : the NLO case.', Journal of high energy physics., 2013 (4). 027.


We present a process-independent technique to consistently combine next-to-leading order parton-level calculations of varying jet multiplicity and parton showers. Double counting is avoided by means of a modified truncated shower scheme. This method preserves both the fixed-order accuracy of the parton-level result and the logarithmic accuracy of the parton shower. We discuss the renormalisation and factorisation scale dependence of the approach and present results from an automated implementation in the SHERPA event generator using the test case of W -boson production at the Large Hadron Collider. We observe a dramatic reduction of theoretical uncertainties compared to existing methods which underlines the predictive power of our novel technique.

Item Type:Article
Keywords:Monte Carlo simulations, NLO computations.
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Publisher statement:© 2013 The Authors. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Date accepted:No date available
Date deposited:09 July 2014
Date of first online publication:April 2013
Date first made open access:No date available

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